Initial Values - Intro to Java Programming Udacity English Japanese

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Education 3.4K views 10 likes 0 dislikes 23 Feb 2015

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When you declare a variable, it's important that you give it an initial value.

変数宣言をする時には初期値を設定する必要があります

Look at this variable. It's name is rocketSpeed. It's type is called double.

この変数を見てください名前はrocketSpeedで型はdoubleと呼ばれています

And I'll talk about what double means in just a minute. What I want to show you

doubleについてはあとで説明します

first is over here, the last part of the variable declaration. And that's the initial value. And it really is important that you always supply an initial value when you declare a variable. Because if you forget, and later use the rocketSpeed variable, that would be an error. Every variable that you used must

まず最初にこれが変数宣言の最後の部分で初期値となります変数宣言にはこの初期値の入力が重要ですもし初期値を設定し忘れると rocketSpeedを使うときにエラーが出ます変数には必ず返す値が必要なのです

really have a value. The best time to set the value is right when you declare

値を設定するのは宣言の後ろです

it. Now, back to the curious type double. That means it's a number that can

ではdoubleについて説明します double型とは小数点を含む数のことです

have a decimal point, such as here, 24,724.573. So, when you see the word double, you should simply think a number with a decimal point. And ignore the curious name. Now, look at this variable declaration. The name is sallyRidesBirthday, the type is the Day class, and the initial value looks like

ここにある24，724．573のような数です doubleを見たら小数点がある数と思ってください変な名前ですが気にしないでくださいではこちらの変数宣言を見てください名前はsallyRidesBirthdayです型はDayクラスで初期値はこれです

this. You will see soon exactly what this syntax means, but when you look at

あとでこの構文が意味することを説明しますが

it, it seems intuitively clear, we make a new Day object with a date 1951, May 26.

直感的に分かりますねそしてDayオブジェクトを1951年5月26日とします

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